Machine for rolling girder-rails



(No ModeL} 3Sheets-Sheet 1.

A. J. MOXHAM. MAUHINE FOB, ROLLING GIRDER RAILS.

No. 391,550. Patented 001;. 23, 1888.

(No Model.) 3 S-heetsSheet 2.

A. J. MOXHAM.

MACHINE FOR ROLLING GIRDER RAILS.

No. 891,550. Patented Oct. 23, 1888 Fig. 2;,

Wiknssms \wvpnkov.

N. PUERS. Pholo-Lilh0gr=phcn Washington. D. c.

(No Model.) W v 3 Sheets-Sheet 3.

A. J. MOXHAM. MACHINE FOR ROLLING GIRDBR RAILS.

N0. 391,550. Patented 0013. 23, v1888.

N, FEYERS. Piwmum m mr, Walhinglumfl. c.

UNITED STATES PATET triers.

ARTHUR J. MOXHAM, OF JOHNSTOVVN, PENNSYLVANIA.

MACHINE FOR ROLLING GlRDER-RAILS.

ESFEGIFIGATION forming part of Letters Patent No. 391,550, dated October 23, 1888.

(No model.)

To aZZ whom, it may concern;

Be it known that I, ARTHUR J. MQXI-IAM, of Johnstown, in the county of Cambria and State of Pennsylvania, have invented certain new and useful Improvements in and Rolls for Rolling Girder-Itails, which invention is fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to provide a rail having an-eXcess of overhang of tram on one side of the web,as compared with the overhang of head' on the other side.

The invention will first be described in detail, and then particularly set forth in the claims.

In the accompanying drawings, the several Figures 1, 2, and 3 show three sets of rolls, respectively, in front elevation. Figs. 4 and 5 show end views of the two rolls illustrated in Fig. 1.

The several passes in said rolls areindicated by numbers as follows: In Fig. 1 are shown five passes, the rolls being the first roughingrolls. In Fig. 2 are shown three passes, the rolls being second roughing-rolls. In Fig. 3 are shown six passes,the rolls being finishingrolls.

In operating said rolls the hot metal to be rolled is first entered flat into pass No. 1, then on the flat also into pass No. 2, then on edge into pass No. 3, then on the flat into pass No. 4, then on edge into pass No. 5, then on the flat into pass No. 6, then on edge into pass No. 7 ,then on the flat into pass No. 8, and then on edge into all the other passes, finishing in the last pass, N o. 14 of Fig. 3. The upper portion of the finished rail consists of an upper offset,which forms the head, and a lower offset, which forms the tram. The two portions so offset are hereinafter spoken of distinct ively.

It will be observed that the rail to be rolled, when finished by its passage through pass No. 14, has its side tram unusually long, the head and tram being located well over the web of the rail, thus leaving a preponderance of metal in the rail on one side of its web. In shaping the rail grooves or passes this is provided for as follows: It is well known in the art of rolling that it is advisable to let the draft of the rolls be equally distributed. If the draft on one portion of the mass of metal being rolled be very much greater than on another portion of the same, the pass thus acted on becomes so distorted that beyond certain small limits its handling and entry into thesub sequent passes is rendered an impossibility, or, if not impossible, attended with so much work and trouble as to be accompanied bycommercial loss. The web of the rail is of necessity a dividing-point in the rolls. In this rail, the largest mass being on one side thereof, the work on the different portions is much varied. In the earlier passes a greater variation of draft can be permitted than in the later passes, as the piece being rolled, owing to its greater mass, offers greater resistance to distortion. It will be observed that in the earlier passes illustrated in the drawings a greater amount of draft is put upon that part of the web of the railunderneath its side tram in the edge-passes, but that the excess of draft is also accompanied by such distribution of draft at the other points of the mass so acted on as to prevent distortion reaching the point of difficulty in the subsequent rolling. An excess of draft is also put upon the side tram in the dummy-passes,greater in the first dummy pass, where such draft is entirely localized on the side tram, and gradually less in. the two subsequent dnmmypasses, where such draft is partially equalized, a certain and proper amount of work being also extended to the head portion. As the rail approaches its finished shape, this inequality in the draft is equalized. It will therefore be observed that the first dummy-pass (No. 4) for this purpose has no dummy action on the head portion of the rail,whereas the second dummy-pass (No. 6) and the third dummy-pass (No. 8) have dummy action to a small extent on the head, as well as on the tram of the rails. By this means the work is equalized and distortion or overstraining of the metal prevented. By the term dummy action, hereinbefore used, is meant such action of the rolls as is productive of the maximum spreading across the axis ofthe rollsof the mass acted on-at local points,accompanied by the minimum of elongation of the rest of the mass in the direction of the rolls travel.

I do not limit myself to the exact number or distribution of passes shown, as the number of passes and their distribution into roughing and finishing passes is to a certain extent ardummy passes, in which the subsequent durn bitrary, being influenced by the length and my-passes exert dummy action on both the I5 diameter of the rolls,a light train of rolls callhead and tram portion, substantially as and ing for more passes with lighter draft than a for the purposes set forth.

5 heavy roll-train. It is also evident that the 2. Rolls for rolling girder-rails, provided rolls can, if desired, be made three-high inwith passes substantially of the form delinestead of two-high, as shown. ated in the drawings and numbered 1 to 14, 20

Having thus fully described my said iminclusive, as and for the purposes set forth. provements, as of my invention I claim-- IO 1. Rolls for rolling girder-rails, provided ARTHUR MOXHAM' with a pass, as'No. 4, exerting no dummy ac- Witnesses: tion on the head portion of the metal in pro G. R. POWELL, cess of rolling, and with successive edging and O. M. J OHNSON. 

